/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");
var storage = LK.import("@upit/storage.v1");
var facekit = LK.import("@upit/facekit.v1");

/**** 
* Classes
****/ 
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -15;
	self.update = function () {
		if (self.angle !== undefined) {
			// Angled movement for turbo bullets
			self.x += Math.sin(self.angle) * Math.abs(self.speed) * 0.5;
			self.y += self.speed;
		} else {
			// Normal straight movement
			self.y += self.speed;
		}
	};
	return self;
});
var Guitar = Container.expand(function () {
	var self = Container.call(this);
	var guitarGraphics = self.attachAsset('guitar', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 3;
	self.points = 5;
	self.instrumentType = 'guitar';
	self.update = function () {
		self.x += self.speed;
	};
	return self;
});
var Gun = Container.expand(function () {
	var self = Container.call(this);
	var gunGraphics = self.attachAsset('gun', {
		anchorX: 0.5,
		anchorY: 1
	});
	self.update = function () {
		if (facekit.mouthCenter.x > 0) {
			self.x = facekit.mouthCenter.x;
		}
	};
	return self;
});
var Instrument = Container.expand(function (type) {
	var self = Container.call(this);
	var instrumentGraphics = self.attachAsset(type, {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.points = 1;
	self.instrumentType = type;
	self.lifespan = 180; // 3 seconds at 60fps
	self.update = function () {
		self.lifespan--;
	};
	return self;
});
var Monster = Container.expand(function () {
	var self = Container.call(this);
	var monsterGraphics = self.attachAsset('monster', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 2;
	self.shootTimer = 0;
	self.shootInterval = 120; // Shoot every 2 seconds at 60fps
	self.health = 3;
	self.points = 20;
	self.update = function () {
		self.x += self.speed;
		// Reverse direction at screen edges
		if (self.x <= 150 || self.x >= 1898) {
			self.speed = -self.speed;
		}
		// Shooting timer
		self.shootTimer++;
		if (self.shootTimer >= self.shootInterval) {
			self.shootTimer = 0;
			// Create monster bullet
			var monsterBullet = new MonsterBullet();
			monsterBullet.x = self.x;
			monsterBullet.y = self.y + 150;
			monsterBullets.push(monsterBullet);
			game.addChild(monsterBullet);
			LK.getSound('monsterShoot').play();
		}
	};
	return self;
});
var MonsterBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('monsterBullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 8;
	self.update = function () {
		self.y += self.speed;
	};
	return self;
});
var Particle = Container.expand(function (x, y, type) {
	var self = Container.call(this);
	var particleGraphics = self.attachAsset(type, {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.x = x;
	self.y = y;
	// Random velocity
	var angle = Math.random() * Math.PI * 2;
	var speed = 5 + Math.random() * 10;
	self.vx = Math.cos(angle) * speed;
	self.vy = Math.sin(angle) * speed;
	// Random rotation speed
	self.rotationSpeed = (Math.random() - 0.5) * 0.3;
	// Lifetime
	self.lifetime = 1000; // 1 second
	// Initial scale
	self.scaleX = self.scaleY = 1;
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x1a1a2e
});

/**** 
* Game Code
****/ 
var gun;
var bullets = [];
var guitars = [];
var instruments = [];
var particles = [];
var monsters = [];
var monsterBullets = [];
var level = 1;
var guitarsHit = 0;
var timeRemaining = 30;
var guitarSpeed = 3;
var instrumentSpawnRate = 120;
var gameTimer;
var spawnTimer = 0;
var lives = 3;
var turboMode = false;
var turboEndTime = 0;
var turboTimerBar;
var turboTimerContainer;
var TURBO_DURATION = 300; // 5 seconds at 60fps
// Add HUD background to GUI layer
var hudBackground = LK.gui.top.addChild(LK.getAsset('hudBg', {
	anchorX: 0.5,
	anchorY: 0
}));
hudBackground.x = 0;
hudBackground.y = 0;
// Adjust width to cover full screen width in GUI coordinates
hudBackground.width = LK.gui.top.width;
// Initialize gun
gun = game.addChild(new Gun());
gun.x = 1024;
gun.y = 2600;
// Score display
var scoreTxt = new Text2('Score: 0', {
	size: 80,
	fill: 0x000000,
	font: "'GillSans-Bold',Impact,'Arial Black',Tahoma"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Level display
var levelTxt = new Text2('Level: 1', {
	size: 60,
	fill: 0x000000,
	font: "'GillSans-Bold',Impact,'Arial Black',Tahoma"
});
levelTxt.anchor.set(1, 0);
levelTxt.x = -20;
LK.gui.topRight.addChild(levelTxt);
// Timer display - larger and more prominent
var timerTxt = new Text2('30', {
	size: 120,
	fill: 0xFFFFFF
});
timerTxt.anchor.set(1, 0);
timerTxt.x = -20;
timerTxt.y = 80;
LK.gui.topRight.addChild(timerTxt);
// Guitars hit display
var guitarsHitTxt = new Text2('Guitars: 0/3', {
	size: 60,
	fill: 0x000000,
	font: "'GillSans-Bold',Impact,'Arial Black',Tahoma"
});
guitarsHitTxt.anchor.set(0.5, 0);
guitarsHitTxt.y = 100;
LK.gui.top.addChild(guitarsHitTxt);
// Lives display container
var livesContainer = new Container();
livesContainer.x = -100;
livesContainer.y = -100;
LK.gui.bottomRight.addChild(livesContainer);
// Create life icons
var lifeIcons = [];
for (var i = 0; i < 3; i++) {
	var lifeIcon = LK.getAsset('life', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	lifeIcon.x = -i * 70; // Changed to position icons to the left
	lifeIcon.y = 0;
	lifeIcons.push(lifeIcon);
	livesContainer.addChild(lifeIcon);
}
// Create turbo timer bar container (initially hidden)
turboTimerContainer = new Container();
turboTimerContainer.x = 20;
turboTimerContainer.y = -60;
turboTimerContainer.visible = false;
LK.gui.bottomLeft.addChild(turboTimerContainer);
// Timer bar background
var timerBarBg = LK.getAsset('hudBg', {
	anchorX: 0,
	anchorY: 0
});
timerBarBg.width = 300;
timerBarBg.height = 20;
timerBarBg.tint = 0x333333;
turboTimerContainer.addChild(timerBarBg);
// Timer bar fill
turboTimerBar = LK.getAsset('hudBg', {
	anchorX: 0,
	anchorY: 0
});
turboTimerBar.width = 300;
turboTimerBar.height = 20;
turboTimerBar.tint = 0x00ff00;
turboTimerContainer.addChild(turboTimerBar);
// Start game timer
gameTimer = LK.setInterval(function () {
	timeRemaining--;
	timerTxt.setText(timeRemaining.toString());
	// Add color change when time is running out
	if (timeRemaining <= 10) {
		timerTxt.setStyle({
			fill: 0xFF0000
		});
	} else {
		timerTxt.setStyle({
			fill: 0xFFFFFF
		});
	}
	if (timeRemaining <= 0) {
		// Lose a life instead of game over
		lives--;
		// Remove a life icon
		if (lifeIcons.length > 0 && lives >= 0) {
			var removedLife = lifeIcons.pop();
			removedLife.destroy();
		}
		// Flash screen red to indicate life lost
		LK.effects.flashScreen(0xFF0000, 500);
		// Check if game over
		if (lives <= 0) {
			LK.showGameOver();
		} else {
			// Reset timer for next life
			timeRemaining = 30;
			timerTxt.setText(timeRemaining.toString());
			// Reset timer color
			timerTxt.setStyle({
				fill: 0xFFFFFF
			});
		}
	}
}, 1000);
// Create particle explosion effect
function createExplosion(x, y) {
	var particleCount = 15 + Math.floor(Math.random() * 10);
	for (var i = 0; i < particleCount; i++) {
		var particleType = Math.random() < 0.5 ? 'particle1' : 'particle2';
		var particle = new Particle(x, y, particleType);
		particles.push(particle);
		game.addChild(particle);
		// Animate particle
		tween(particle, {
			scaleX: 0,
			scaleY: 0,
			alpha: 0
		}, {
			duration: particle.lifetime,
			easing: tween.easeOut,
			onFinish: function onFinish() {
				// Particle will be cleaned up in update loop
			}
		});
	}
}
// Play background music
LK.playMusic('bgmusic');
// Variables for long press shooting
var isPressed = false;
var shootTimer = null;
// Function to create and fire a bullet
function fireBullet() {
	if (turboMode) {
		// Fire three bullets in spread pattern
		var angles = [-0.3, 0, 0.3]; // Spread angles in radians
		for (var i = 0; i < 3; i++) {
			var newBullet = new Bullet();
			newBullet.x = gun.x;
			newBullet.y = gun.y - 120;
			// Add angle to bullet movement
			newBullet.angle = angles[i];
			newBullet.speed = -15;
			bullets.push(newBullet);
			game.addChild(newBullet);
		}
	} else {
		// Normal single bullet
		var newBullet = new Bullet();
		newBullet.x = gun.x;
		newBullet.y = gun.y - 120;
		bullets.push(newBullet);
		game.addChild(newBullet);
	}
	LK.getSound('shoot').play();
}
// Screen tap/click handler for shooting
game.down = function (x, y, obj) {
	isPressed = true;
	// Fire immediately on press
	fireBullet();
	// Start continuous shooting timer
	shootTimer = LK.setInterval(function () {
		if (isPressed) {
			fireBullet();
		}
	}, 200); // Fire every 200ms while pressed
};
// Screen release handler to stop shooting
game.up = function (x, y, obj) {
	isPressed = false;
	if (shootTimer) {
		LK.clearInterval(shootTimer);
		shootTimer = null;
	}
};
game.update = function () {
	// Check turbo mode timer
	if (turboMode) {
		var timeLeft = turboEndTime - LK.ticks;
		if (timeLeft <= 0) {
			turboMode = false;
			turboTimerContainer.visible = false;
			LK.effects.flashScreen(0xffffff, 200);
		} else {
			// Update timer bar width based on remaining time
			var progress = timeLeft / TURBO_DURATION;
			turboTimerBar.width = 300 * progress;
		}
	}
	// Shooting is now handled by screen tap/click in game.down event
	// Spawn guitars
	if (LK.ticks % 180 === 0) {
		// Every 3 seconds
		var newGuitar = new Guitar();
		newGuitar.x = -60;
		newGuitar.y = 500; // Moved lower to avoid HUD overlap
		newGuitar.speed = guitarSpeed;
		guitars.push(newGuitar);
		game.addChild(newGuitar);
	}
	// Spawn monsters occasionally
	if (LK.ticks % 600 === 0 && monsters.length < 2) {
		// Every 10 seconds, max 2 monsters
		var newMonster = new Monster();
		newMonster.x = 300 + Math.random() * 1448;
		newMonster.y = 400;
		monsters.push(newMonster);
		game.addChild(newMonster);
	}
	// Spawn random instruments
	spawnTimer++;
	if (spawnTimer >= instrumentSpawnRate) {
		spawnTimer = 0;
		var types = ['drum', 'flute', 'piano', 'saxophone', 'xylophone', 'tuba', 'harp'];
		// Only add bomb and turbo to spawn types if not in turbo mode
		if (!turboMode) {
			types.push('bomb');
			types.push('turbo');
		}
		var type = types[Math.floor(Math.random() * types.length)];
		var newInstrument = new Instrument(type);
		// Try to find a non-overlapping position
		var maxAttempts = 50;
		var attempts = 0;
		var validPosition = false;
		while (!validPosition && attempts < maxAttempts) {
			newInstrument.x = 300 + Math.random() * 1448;
			newInstrument.y = 500 + Math.random() * 1600;
			// Check if this position overlaps with existing instruments
			validPosition = true;
			for (var m = 0; m < instruments.length; m++) {
				var existingInstrument = instruments[m];
				var dx = newInstrument.x - existingInstrument.x;
				var dy = newInstrument.y - existingInstrument.y;
				var distance = Math.sqrt(dx * dx + dy * dy);
				var minDistance = 300; // Increased minimum distance between instruments
				if (distance < minDistance) {
					validPosition = false;
					break;
				}
			}
			// If this is a bomb, also check overlap with guitars
			if (validPosition && type === 'bomb') {
				for (var n = 0; n < guitars.length; n++) {
					var guitar = guitars[n];
					var dx = newInstrument.x - guitar.x;
					var dy = newInstrument.y - guitar.y;
					var distance = Math.sqrt(dx * dx + dy * dy);
					var minDistance = 300; // Same minimum distance for guitars
					if (distance < minDistance) {
						validPosition = false;
						break;
					}
				}
			}
			attempts++;
		}
		// Only add instrument if we found a valid position
		if (validPosition) {
			// Set special properties for bomb
			if (type === 'bomb') {
				newInstrument.points = -1; // Special marker for bomb
				newInstrument.instrumentType = 'bomb';
			} else if (type === 'turbo') {
				newInstrument.points = 10;
				newInstrument.instrumentType = 'turbo';
			}
			instruments.push(newInstrument);
			game.addChild(newInstrument);
		}
	}
	// Update monster bullets
	for (var i = monsterBullets.length - 1; i >= 0; i--) {
		var monsterBullet = monsterBullets[i];
		if (monsterBullet.y > 2800) {
			monsterBullet.destroy();
			monsterBullets.splice(i, 1);
			continue;
		}
		// Check collision with gun/player area
		var dx = monsterBullet.x - gun.x;
		var dy = monsterBullet.y - gun.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		if (distance < 100) {
			// Hit player
			lives--;
			if (lifeIcons.length > 0 && lives >= 0) {
				var removedLife = lifeIcons.pop();
				removedLife.destroy();
			}
			LK.effects.flashScreen(0xFF0000, 500);
			createExplosion(monsterBullet.x, monsterBullet.y);
			monsterBullet.destroy();
			monsterBullets.splice(i, 1);
			if (lives <= 0) {
				LK.showGameOver();
			}
			continue;
		}
	}
	// Update bullets
	for (var i = bullets.length - 1; i >= 0; i--) {
		var bullet = bullets[i];
		if (bullet.y < -20) {
			bullet.destroy();
			bullets.splice(i, 1);
			continue;
		}
		// Check guitar collisions
		for (var j = guitars.length - 1; j >= 0; j--) {
			var guitar = guitars[j];
			if (bullet.intersects(guitar)) {
				LK.setScore(LK.getScore() + guitar.points);
				scoreTxt.setText('Score: ' + LK.getScore());
				guitarsHit++;
				guitarsHitTxt.setText('Guitars: ' + guitarsHit + '/3');
				LK.getSound('guitarHit').play();
				LK.effects.flashObject(guitar, 0xFFFFFF, 300);
				createExplosion(guitar.x, guitar.y);
				guitar.destroy();
				guitars.splice(j, 1);
				bullet.destroy();
				bullets.splice(i, 1);
				// Check level advancement
				if (guitarsHit >= 3) {
					level++;
					levelTxt.setText('Level: ' + level);
					guitarsHit = 0;
					guitarsHitTxt.setText('Guitars: 0/3');
					timeRemaining = 30;
					guitarSpeed += 2;
					// Increase spawn frequency more aggressively: decrease by 30 instead of 20, with minimum of 30 instead of 60
					instrumentSpawnRate = Math.max(30, instrumentSpawnRate - 30);
				}
				break;
			}
		}
		if (i < 0 || i >= bullets.length) continue;
		// Check instrument collisions
		for (var k = instruments.length - 1; k >= 0; k--) {
			var instrument = instruments[k];
			if (bullet.intersects(instrument)) {
				// Handle bomb collision
				if (instrument.instrumentType === 'bomb') {
					lives--;
					// Remove a life icon
					if (lifeIcons.length > 0 && lives >= 0) {
						var removedLife = lifeIcons.pop();
						removedLife.destroy();
					}
					LK.effects.flashScreen(0xFF0000, 500);
					LK.getSound('bombHit').play();
					if (lives <= 0) {
						LK.showGameOver();
					}
				} else if (instrument.instrumentType === 'turbo') {
					// Activate turbo mode
					turboMode = true;
					turboEndTime = LK.ticks + TURBO_DURATION;
					turboTimerContainer.visible = true;
					LK.effects.flashScreen(0x00ff00, 300);
					LK.getSound('turboHit').play();
					LK.setScore(LK.getScore() + 10);
					scoreTxt.setText('Score: ' + LK.getScore());
				} else {
					// Normal instrument hit
					LK.setScore(LK.getScore() + instrument.points);
					scoreTxt.setText('Score: ' + LK.getScore());
					// Play specific sound based on instrument type
					if (instrument.instrumentType === 'drum') {
						LK.getSound('drumHit').play();
					} else if (instrument.instrumentType === 'flute') {
						LK.getSound('fluteHit').play();
					} else if (instrument.instrumentType === 'piano') {
						LK.getSound('pianoHit').play();
					} else if (instrument.instrumentType === 'saxophone') {
						LK.getSound('saxophoneHit').play();
					} else if (instrument.instrumentType === 'xylophone') {
						LK.getSound('xylophoneHit').play();
					} else if (instrument.instrumentType === 'tuba') {
						LK.getSound('tubaHit').play();
					} else if (instrument.instrumentType === 'harp') {
						LK.getSound('harpHit').play();
					}
				}
				LK.effects.flashObject(instrument, 0xFFFFFF, 300);
				createExplosion(instrument.x, instrument.y);
				instrument.destroy();
				instruments.splice(k, 1);
				bullet.destroy();
				bullets.splice(i, 1);
				break;
			}
		}
		if (i < 0 || i >= bullets.length) continue;
		// Check monster collisions
		for (var m = monsters.length - 1; m >= 0; m--) {
			var monster = monsters[m];
			if (bullet.intersects(monster)) {
				monster.health--;
				createExplosion(bullet.x, bullet.y);
				bullet.destroy();
				bullets.splice(i, 1);
				if (monster.health <= 0) {
					LK.setScore(LK.getScore() + monster.points);
					scoreTxt.setText('Score: ' + LK.getScore());
					createExplosion(monster.x, monster.y);
					monster.destroy();
					monsters.splice(m, 1);
				} else {
					LK.effects.flashObject(monster, 0xFF0000, 200);
				}
				break;
			}
		}
	}
	// Update guitars
	for (var i = guitars.length - 1; i >= 0; i--) {
		var guitar = guitars[i];
		// Check for collisions with instruments and destroy them
		for (var q = instruments.length - 1; q >= 0; q--) {
			var instrument = instruments[q];
			if (guitar.intersects(instrument)) {
				// Create explosion effect
				createExplosion(instrument.x, instrument.y);
				// Destroy the instrument
				instrument.destroy();
				instruments.splice(q, 1);
			}
		}
		if (guitar.x > 2108) {
			guitar.destroy();
			guitars.splice(i, 1);
		}
	}
	// Update instruments
	for (var i = instruments.length - 1; i >= 0; i--) {
		var instrument = instruments[i];
		if (instrument.lifespan <= 0) {
			instrument.destroy();
			instruments.splice(i, 1);
		}
	}
	// Update particles
	for (var i = particles.length - 1; i >= 0; i--) {
		var particle = particles[i];
		// Update position
		particle.x += particle.vx;
		particle.y += particle.vy;
		// Apply gravity
		particle.vy += 0.5;
		// Apply rotation
		particle.rotation += particle.rotationSpeed;
		// Slow down horizontal movement
		particle.vx *= 0.98;
		// Remove dead particles
		if (particle.alpha <= 0) {
			particle.destroy();
			particles.splice(i, 1);
		}
	}
	// Update monsters (cleanup if needed)
	for (var i = monsters.length - 1; i >= 0; i--) {
		var monster = monsters[i];
		// Monsters are persistent, only removed when destroyed by bullets
	}
};

===================================================================
--- original.js
+++ change.js
@@ -67,8 +67,52 @@
 		self.lifespan--;
 	};
 	return self;
 });
+var Monster = Container.expand(function () {
+	var self = Container.call(this);
+	var monsterGraphics = self.attachAsset('monster', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = 2;
+	self.shootTimer = 0;
+	self.shootInterval = 120; // Shoot every 2 seconds at 60fps
+	self.health = 3;
+	self.points = 20;
+	self.update = function () {
+		self.x += self.speed;
+		// Reverse direction at screen edges
+		if (self.x <= 150 || self.x >= 1898) {
+			self.speed = -self.speed;
+		}
+		// Shooting timer
+		self.shootTimer++;
+		if (self.shootTimer >= self.shootInterval) {
+			self.shootTimer = 0;
+			// Create monster bullet
+			var monsterBullet = new MonsterBullet();
+			monsterBullet.x = self.x;
+			monsterBullet.y = self.y + 150;
+			monsterBullets.push(monsterBullet);
+			game.addChild(monsterBullet);
+			LK.getSound('monsterShoot').play();
+		}
+	};
+	return self;
+});
+var MonsterBullet = Container.expand(function () {
+	var self = Container.call(this);
+	var bulletGraphics = self.attachAsset('monsterBullet', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.speed = 8;
+	self.update = function () {
+		self.y += self.speed;
+	};
+	return self;
+});
 var Particle = Container.expand(function (x, y, type) {
 	var self = Container.call(this);
 	var particleGraphics = self.attachAsset(type, {
 		anchorX: 0.5,
@@ -104,8 +148,10 @@
 var bullets = [];
 var guitars = [];
 var instruments = [];
 var particles = [];
+var monsters = [];
+var monsterBullets = [];
 var level = 1;
 var guitarsHit = 0;
 var timeRemaining = 30;
 var guitarSpeed = 3;
@@ -341,8 +387,17 @@
 		newGuitar.speed = guitarSpeed;
 		guitars.push(newGuitar);
 		game.addChild(newGuitar);
 	}
+	// Spawn monsters occasionally
+	if (LK.ticks % 600 === 0 && monsters.length < 2) {
+		// Every 10 seconds, max 2 monsters
+		var newMonster = new Monster();
+		newMonster.x = 300 + Math.random() * 1448;
+		newMonster.y = 400;
+		monsters.push(newMonster);
+		game.addChild(newMonster);
+	}
 	// Spawn random instruments
 	spawnTimer++;
 	if (spawnTimer >= instrumentSpawnRate) {
 		spawnTimer = 0;
@@ -403,8 +458,37 @@
 			instruments.push(newInstrument);
 			game.addChild(newInstrument);
 		}
 	}
+	// Update monster bullets
+	for (var i = monsterBullets.length - 1; i >= 0; i--) {
+		var monsterBullet = monsterBullets[i];
+		if (monsterBullet.y > 2800) {
+			monsterBullet.destroy();
+			monsterBullets.splice(i, 1);
+			continue;
+		}
+		// Check collision with gun/player area
+		var dx = monsterBullet.x - gun.x;
+		var dy = monsterBullet.y - gun.y;
+		var distance = Math.sqrt(dx * dx + dy * dy);
+		if (distance < 100) {
+			// Hit player
+			lives--;
+			if (lifeIcons.length > 0 && lives >= 0) {
+				var removedLife = lifeIcons.pop();
+				removedLife.destroy();
+			}
+			LK.effects.flashScreen(0xFF0000, 500);
+			createExplosion(monsterBullet.x, monsterBullet.y);
+			monsterBullet.destroy();
+			monsterBullets.splice(i, 1);
+			if (lives <= 0) {
+				LK.showGameOver();
+			}
+			continue;
+		}
+	}
 	// Update bullets
 	for (var i = bullets.length - 1; i >= 0; i--) {
 		var bullet = bullets[i];
 		if (bullet.y < -20) {
@@ -497,8 +581,29 @@
 				bullets.splice(i, 1);
 				break;
 			}
 		}
+		if (i < 0 || i >= bullets.length) continue;
+		// Check monster collisions
+		for (var m = monsters.length - 1; m >= 0; m--) {
+			var monster = monsters[m];
+			if (bullet.intersects(monster)) {
+				monster.health--;
+				createExplosion(bullet.x, bullet.y);
+				bullet.destroy();
+				bullets.splice(i, 1);
+				if (monster.health <= 0) {
+					LK.setScore(LK.getScore() + monster.points);
+					scoreTxt.setText('Score: ' + LK.getScore());
+					createExplosion(monster.x, monster.y);
+					monster.destroy();
+					monsters.splice(m, 1);
+				} else {
+					LK.effects.flashObject(monster, 0xFF0000, 200);
+				}
+				break;
+			}
+		}
 	}
 	// Update guitars
 	for (var i = guitars.length - 1; i >= 0; i--) {
 		var guitar = guitars[i];
@@ -543,5 +648,10 @@
 			particle.destroy();
 			particles.splice(i, 1);
 		}
 	}
+	// Update monsters (cleanup if needed)
+	for (var i = monsters.length - 1; i >= 0; i--) {
+		var monster = monsters[i];
+		// Monsters are persistent, only removed when destroyed by bullets
+	}
 };
\ No newline at end of file